JPS5826033B2 - Image display device that displays images on a scan display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image display device for displaying images on a rusk scan display device.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image display device that has a refresh memory and a plurality of latch sections so that a plurality of characters can appear in a superimposed manner on a television screen.

Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of the entire display device. Horizontal and vertical synchronizing signals from a color television main body 1 enter an access signal generator 2, and the access signal generator 2 controls refresh memories 3 and 4 horizontally and vertically. Accessed vertically.

Signals from the refresh memories 3 and 4 are selected by a refresh memory selection gate 5, either one or both of them being selected simultaneously, and a character address is input to a character generator 6.

This character generator 6 receives a line signal from a line signal generator 7 which receives horizontal and vertical synchronizing signals as input, and the character address described above, and outputs written characters, figures, symbols, etc. to an intermediate output device 8. It is designed to be encoded and sent to the switching circuit 9 as a PID information.

This switching circuit 9 can be switched to a plurality of latch sections 1o and ii, and the aforementioned bit N information is input to the image signal generator 13 through the rear wheel gate 12 latched by the latch section 10.11. It looks like it will be done.

The switching circuit 9, the launch sections 10 and 11, and the logic gate 12 form the intermediate output device 8.

An image signal is input from the image signal generating device 13 to the color television main body 1, and a designated color image is displayed by the color television main body 1.

Next, the actual image display when only the refresh memory 3 is used will be explained in detail based on FIG. 2.

First, the horizontal and vertical synchronization signals are transmitted to the access signal generator 2.
The position corresponding to the scanning line of the refresh memory 3 is accessed by the access signal.

Now, when the access is at the first point indicated by the symbol "1", the character generator 6 generates a character.
A character address signal enters the character generator 6 to detect the 25th column of the storage memory 14.

Each column of the character storage memory 14 is divided into n squares as shown in FIG. It has become.

Each of these n squares is further subdivided as shown in the figure, and each of these is divided into bits t'
lt report has been written.

Since the character address signal described above only has a command to display the character number of the character storage memory 14 at a predetermined position corresponding to the refresh memory 3 on the television screen, each of the characters shown in FIG. A line signal for selecting a square is applied from the line signal generator 7 to the character generator 6.

The signal from this character generator 6 is transmitted to the switching circuit 9, the latch section 10, and the logic gate 1.
2. The image passes through the image signal generator 13 and is displayed at a predetermined position on the color television main body 1.

A shift register can be considered as the substance of the latch sections 1o and ii.

This shift register sequentially shifts the latched data points one by one in the right direction and outputs them.

This latched data bit turns on the dot corresponding to one of "1" and "0" and turns off the other, and the on dots form a triangle in the 25th column.

The error display will be described later.

In the color television main body 1, a triangular character is formed only when the scanning line scans between half squares A and B, but when the scanning line moves from half square A to B, that is, the character is formed. It is assumed that at the time when half of the bits written in the 25th column of the storage memory 14 are output from the latch section (shift register), the above-mentioned access signal indicates the next square 10 in the refresh memory 3.

Then, the character written in the 36th column of the character storage memory 14 is detected according to this square 10.

This output signal is then output by the switching circuit 9.
The character is latched by the latch portion 11, and an image is displayed as described above. For example, if this 36th character is a circle, this circle is displayed starting from half square B.

In half-square B, since the right half of the triangle is still latched by the latch portion 10, the triangle and circle are displayed with each half overlapping each other.

Similarly, by switching the switching circuit 9, the latch section 10 is set to 1 of the refresh memory 3.
The character written in the square - storage memory 1
The 89th character of 4 is latched.

If this character is a square, the square is displayed in half squares C and D, but in half square C, each half overlaps with a circle.

By switching the launch section in this way, a plurality of latched signals are passed through the logic gates, and the results of the logic operations are input to the image display device, so that each character can be displayed in an overlapping manner.

Next, based on FIG. 4, the refresh memo IJ-3, 4
We will explain the case where both are used.

First, a case will be described in which the refresh memories IJ-3 and IJ-4 are alternately used.

The refresh memory 3 is accessed first in the top row for the first, say 20 horizontal scans after vertical retrace, while the refresh memory 4 is accessed first in the top row for the first, say 10 horizontal scans. First, the eyes are accessed.

The refresh memory selection gate 5 is first set to the refresh memory 3gIII? When you select this, the first thing you need to do is
A triangle is displayed on the screen of the color television main body 1 corresponding to "A".

Next, when the refresh memory selection gate 5 is switched to the refresh memory 4 side, the access signal switching in the vertical direction by the access signal generator 2 is halved, so the triangle at the "mouth" position is shown as a broken line on the screen. It will be displayed as follows.

That is, the same figure can be displayed with the squares in the refresh memory 3 shifted by half.

Of course, the switching of the refresh memory selection gate 5 is automatically performed by a pre-processed program.

The refresh memory 3 forms one square with 20 synchronizing signals in the vertical direction, and the refresh memory 4 forms a square in the first column with 10 vertical synchronizing signals, and 20 vertical synchronizing signals in the second and subsequent columns. Make it into a book.

Then, the address of the character shown in the figure is written into each refresh memory, and the refresh memory selection gate 5 is set to OR logic.

The OR output of this character address is passed through the character generator 6, and the output signal is further sent to the color television main body 1 through the intermediate output device 8 and the image signal generator 13, and an image as shown in the figure is displayed on the surface of the color television main body 1. get.

That is, the interval between displayed characters can be made narrower by half a square in the vertical direction than when only the refresh memory 3 is used.

Next, color display will be explained based on FIGS. 2, 6, and 7.

The refresh pattern of the refresh memories 3 and 4 is the 6th refresh pattern.
As shown in the figure, it consists of a character information bit a, a color information bit b, and one priority color information bit C.

An attached launch unit 15 latches the color alert bit B1 and the priority color alert bit C in each of the latch units 10 and 11.
．． 16 is provided to take in these updates from the refresh memories 3 and 4 in synchronization with the character-dot latch.

When either one of the character dots sequentially output from the latch sections 10 and 11 is on, the color report latched in that latch section is sent to the image signal generator 13 through the gate.

For example, if the color of the 25th character, that is, a triangular dot in the character storage memory 14 is blue, a blue triangle will be displayed.

Similarly, if the color of the 36th character, that is, the circular dot, is red, a red circle will be obtained.

Then, in the on-dot where the two overlap, compare the priority color report parts and, for example, give priority to "1" over IOJ, and in the overlapping part, if you set the triangular priority color report part to "1", it will be completely blue. A triangle is obtained.

If both the triangle and the circle are off-dots, the background color information is sent to the image signal generator 13 through the gate.

Since this color information simply displays the color specified by the bit, the color information can be applied to the logic gate 12 independently of the character information as shown in FIG. good.

Further, as for the color of the bank on the screen, a designated color, for example yellow, may be separately added to the logic gate 12.

In FIG. 5, a case has been described in which an image is displayed by opening both gates of the refresh memory 3.4, but as mentioned above, the refresh memory 3 has a horizontal scanning range of 1 to 4.
20, 21 to 40. 41 to 60 form a square in the vertical direction, whereas the refresh memory 4 has a horizontal scanning pattern of 1 to 10. 11 to 30, 31 to 5.
0... forms a negative square in the vertical direction.

Therefore, horizontal scanning 1 to 20 of the refresh memory 3
``I'', ``RO J, l wa'' written up to this point, and ``1'', ``HA'' and ``HE'' written in horizontal scanning 31 to 50 of the refresh memory 4 are completely written as shown in Figure 5. In order to display on the color television main body 1 in such a manner, the line count phase is sent to the line signal generator 7 together with the refresh memory selection signal (in this case, a signal that opens both gates at the same time) as shown in FIG. Priority signal must be input.

That is, when scanning lines 1 to 20 are scanned, a line signal with a phase corresponding to the refresh memory 3 must be output to the character generator 6, and when scanning lines 31 to 50 are scanned, a line signal of a phase corresponding to the refresh memory 3 must be output to the character generator 6. A line signal with a phase corresponding to 4 must be output to the character generator 6.

For this purpose, a mark bit d is provided at the left end of the refresh pattern of the refresh memos IJ-3 and IJ-4.

Then, the line count phase priority signal of the refresh memory whose mark bit is "1" may be sent to the line signal generator 7 through the logic circuit 17.

and one of the refresh memories 3, 4
is selected, the line signal generator 7 receives the refresh memory selection signal and outputs a line signal with a phase corresponding to the selected refresh memory 3 or 4 to the character generator 6. Just do it like this.

The present invention has the above-described configuration and operation, and in particular, is configured to input a signal to an image signal generator according to the logical operation results of a plurality of launched signals latched in a plurality of latch sections. , different characters can appear overlapping each other in the horizontal direction of the screen.

Therefore, an X or an O can be displayed superimposed on the character.

[Brief explanation of drawings]

Figure 1 is a block diagram of the entire device, Figure 2 is a combination of character patterns and block circuits when one refresh memory is used, Figure 3 is a refresh pattern diagram,
Figure 4 is a combination diagram of character patterns and block circuits when refreshing memory is switched alternately.
Figure 5 is the same diagram as Figure 4 when the gates of two refresh memories are opened at the same time, Figure 6 is a refresh pattern diagram, Figure 7 is a block diagram showing color signal input, and Figure 8 is a refresh memory. This is a diagram showing the input of the line signal generator when using memories at the same time. 〇3.4...
・Refresh memory, 6...characters
Generator, 7... line signal generator,
10, 11... Latch unit, 13... Image signal generator.

Claims (1)

[Claims] 1 has a refresh memory IJ-3, 4 in which character address information is written, and the character specified by the character address signals from the refresh memories 3, 4 and the line signal from the line signal generator 7. Character generator 6 that generates patterns
The output signals from the latches are alternately latched in a plurality of latch units 10.11, the latched signals are held for a time longer than the minimum latch interval, and one or more of the latched signals are An image display device for displaying an image on a scan display device, characterized in that a signal is inputted to an image signal generator 13 according to a logical operation result.